EP2677679B1 - Procédé et système de précodage dans le cas d'un multiplexage dans un espace en boucle ouverte, et procédé d'indication de précodage - Google Patents

Procédé et système de précodage dans le cas d'un multiplexage dans un espace en boucle ouverte, et procédé d'indication de précodage Download PDF

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EP2677679B1
EP2677679B1 EP11858829.2A EP11858829A EP2677679B1 EP 2677679 B1 EP2677679 B1 EP 2677679B1 EP 11858829 A EP11858829 A EP 11858829A EP 2677679 B1 EP2677679 B1 EP 2677679B1
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different
mod
precoding
base station
layer data
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EP2677679A1 (fr
EP2677679A4 (fr
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Yijian Chen
Yu Ngok Li
Yunfeng Sun
Junfeng Zhang
Senbao Guo
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present document relates to the field of the mobile communication technology, and in particular, to a precoding method and system for open loop spatial multiplexing and a precoding indication method.
  • a spatial multiplexing mode is adopted between a sending end and a receiving end and multiple antennas are used to obtain higher transmission rate.
  • the common spatial multiplexing technology based on the closed loop feedback can be described as that: the receiving end feeds back the channel state information (abbreviated as CSI) to the sending end, the sending end uses some transmission precoding technologies according to the acquired channel information, and thus the transmission performance is greatly improved.
  • CSI channel state information
  • the closed loop spatial multiplexing technology is not applicable sometimes; for example, the link quality of the uplink feedback is poor and the channel information can not be fed back accurately.
  • the movement speed of the terminal is very fast, so the channel between the base station and the terminal changes very fast (the movement leads to the Doppler frequency shift, and brings the changes on the time domain); the time delay brought by the feedback link and the schedule, etc., makes the fed back CSI information of the previous channel be unable to represent the real-time channel information very well, which causes mismatching of the precoding.
  • the open loop spatial multiplexing can support the space multiplexing well in the case of not obtaining the channel state information.
  • x 0 i ⁇ x v ⁇ 1 i is a symbol to be sent
  • ⁇ is the number of layers of the transmission data
  • U matrix is a matrix related to the number of layers ⁇
  • D ( i ) is a matrix related to a frequency location i and the number of layers ⁇ .
  • W ( i ) is a matrix related to the frequency location i and the number of layers ⁇ .
  • W ( i ) is a fixed 2 ⁇ 2 unit matrix;
  • the value of the W ( i ) can be C 1 , C 2 , C 3 , C 4 , and the specific value is related to the value of i;
  • the C 1 , C 2 , C 3 , C 4 are the code words of which the indexes corresponding to the ⁇ layers are 12, 13, 14 and 15 in the 4 antennas codebook (table 2).
  • W n I ⁇ 2 u n u n H / u n H u n , I is a unit matrix, W k j represents the j th column vector of the matrix W k .
  • W k j 1 , j 2 , ... j n represents a matrix composed by the j 1 th ,j 2 th ,...j n th columns of the matrix W k .
  • the main scenario considered when designing the scheme is a channel in a single polarized antenna scenario, and the channel in the dual polarized antenna scenario is not considered.
  • the technical problem to be solved by the present document is to provide a precoding method and system for open loop spatial multiplexing as defined in the independent claims, to implement effective precoding in the case of the open loop spatial multiplexing.
  • the above-mentioned method further can have the following characteristics: the u a contains N columns, the n th column is V a n , and V a n is related with i.
  • ⁇ is a scalar in a following set ⁇ 1, j ,-1,- j ⁇ .
  • the above-mentioned method further can have the following characteristics: the u b contains M columns, the n th column is V b n , and V b n is related with i.
  • the above-mentioned method further can have the following characteristics: when the N-layer data and the M-layer data belong to the same user, the u a and the u b are same or different; when a sum of the M and the N is greater than 2 and the u a and the u b are different, the columns contained in the u a are a subset of the columns contained in the u b , or the columns contained in the u b are a subset of the columns contained in the u a .
  • the above-mentioned method further can have the following characteristics: when the N-layer data and the M-layer data belong to different users, the u a and the u b are different.
  • the above-mentioned method further can have the following characteristics: the u a and the u b are orthogonal.
  • the above-mentioned system further can have the following characteristics:
  • ⁇ is a scalar in a following set ⁇ 1, j ,-1,- j ⁇ .
  • the above-mentioned system further can have the following characteristics: the u b contains M columns, the n th column is V b n , and V b n is related with i.
  • the above-mentioned system further can have the following characteristics:
  • a precoding indication method for open loop spatial multiplexing including: a base station determining precoding modes of data of all layers to be sent, and notifying terminals corresponding to data of all layers of the precoding modes corresponding to the data of all layers.
  • the above-mentioned system further can have the following characteristics: the precoding mode refers to the number of precoding operations performed on the data to be sent and the number of the data layers processed in every precoding operation.
  • the above-mentioned system further can have the following characteristics: the terminals calculate and report channel quality indications according to acquired precoding modes of the data of all layers.
  • the embodiment of the present document can implement effective precoding in the case of open loop spatial multiplexing, and also can support multiple antennas (such as 8 transmission antennas) application.
  • the precoding system for open loop spatial multiplexing of the present document includes a base station device and a terminal.
  • the u a contains N columns, the n th column is V a n , and V a n is related with i.
  • V a n 1 e j 2 ⁇ ⁇ X / 32 e j 4 ⁇ ⁇ X / 32 e j 6 ⁇ ⁇ X / 32 T , wherein, X is an integer, and values of the X are different for different ns.
  • ⁇ is a scalar in a following set ⁇ 1, j ,-1,- j ⁇ .
  • the u b contains M columns, the n th column is V b n , and the V b n is related with i.
  • the u a and the u b are same or different; when a sum of the M and the N is greater than 2 and the u a and the u b are different, the columns contained in the u a are a subset of the columns contained in the u b , or the columns contained in the u b are a subset of the columns contained in the u a ; and when the N-layer data and the M-layer data belong to different users, the u a and the u b are orthogonal.
  • the u a contains N columns, the n th column is V a n , and V a n is related with i.
  • V a n 1 e j 2 ⁇ ⁇ X / 32 e j 4 ⁇ ⁇ X / 32 e j 6 ⁇ ⁇ X / 32 T , wherein, X is an integer, and values of the X are different for different ns .
  • ⁇ is a scalar in a following set ⁇ 1, j ,-1,- j ⁇ .
  • the u b contains M columns, the n th column is V b n , and V b n is related with i.
  • V b n 1 e j 2 ⁇ ⁇ X / 32 e j 4 ⁇ ⁇ X / 32 e j 6 ⁇ ⁇ X / 32 T , wherein, X is an integer, and values of the X are different for different ns .
  • ⁇ is a scalar in the following set ⁇ 1, j ,-1,- j ⁇ .
  • the u a and the u b are same or different; when a sum of the M and the N is greater than 2 and the u a and the u b are different, the columns contained in the u a are a subset of the columns contained in the u b , or the columns contained in the u b are a subset of the columns contained in the u a .
  • the u a and the u b are different; specifically, the u a and the u b are orthogonal.
  • the sending end (the base station) performs the open loop precoding on at least 2 UEs.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 2 UEs, and each UE is of one layer.
  • REs resource Element
  • u a contains one column V a 1 , and the column is v f a ( i ) .
  • ⁇ ( md a , i ).
  • V f a i 1 e j 2 ⁇ f a i / 32 e j 4 ⁇ f a i / 32 e j 6 ⁇ f a i / 32 T .
  • g md a i j md a + i , wherein, md a is an initial value, i is a resource index number, and j is an imaginary number identifier.
  • u b contains one column V b 1 , and the column is v f b ( i ).
  • ⁇ g ( md b , i ).
  • v f b i 1 e j 2 ⁇ f b i / 32 e j 4 ⁇ f b i / 32 e j 6 ⁇ f b i / 32 T .
  • g ( md b , i ) j ( md b + i )
  • md b is an initial value
  • i is a resource index number
  • j is an imaginary number identifier.
  • g ( md b , i ) needs to be equal to - g ( md a , i ), and further g ( md b , i ) and the g ( md a , i ) can be scalars of the following set ⁇ 1, j ,-1,- j ⁇ .
  • q is an integer
  • the values of p1, p2, p3 and p4 are one of 1, 2, 3 and 4, and are different from each other;
  • the sending end (the base station) performs the open loop precoding on at least 2 UEs.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 2 UEs, wherein, one UE is of two layers, and one UE is of one layer.
  • REs resource Element
  • u a contains two columns; the first column V a 1 is v f a ( i ) , and the second column V a 2 is v h a ( i ) .
  • ⁇ g ( md a ,i ).
  • v f a i 1 e j 2 ⁇ f a i / 32 e j 4 ⁇ f a i / 32 e j 6 ⁇ f a i / 32 T .
  • v h a i 1 e j 2 ⁇ h a i / 32 e j 4 ⁇ h a i / 32 e j 6 ⁇ h a i / 32 T .
  • g ( md a , i ) j ( md a + i ) , wherein, md a is an initial value, i is a resource index number, and j is an imaginary number identifier.
  • u b contains one column V b 1 , and the column is v f b ( i ) .
  • ⁇ g ( md b , i ).
  • v f b i 1 e j 2 ⁇ f b i / 32 e j 4 ⁇ f b i / 32 e j 6 ⁇ f b i / 32 T .
  • g ( md b , i ) j ( md b + i )
  • md b is an initial value
  • i is a resource index number
  • j is an imaginary number identifier.
  • g ( md b , i ) needs to be equal to - g ( md a , i ), and further g ( md b , i ) and the g ( md a , i ) can be scalars of the following set ⁇ 1, j ,-1,- j ⁇ .
  • q is an integer
  • the values of p1, p2, p3 and p4 are one of 1, 2, 3 and 4, and are different from each other;
  • the sending end (the base station) performs the open loop precoding on at least 2 UEs.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 2 UEs, wherein, the two UEs are all of two layers.
  • REs resource Element
  • u a contains two columns; the first column V a 1 is v f a ( i ) , and the second column V a 2 is v h a ( i ) .
  • ⁇ g ( md a , i ).
  • v f a i 1 e j 2 ⁇ f a i / 32 e j 4 ⁇ f a i / 32 e j 6 ⁇ f a i / 32 T .
  • v h a i 1 e j 2 ⁇ h a i / 32 e j 4 ⁇ h a i / 32 e j 6 ⁇ h a i / 32 T .
  • g ( md a , i ) j ( md a + i ) , wherein, md a is an initial value, i is a resource index number, and j is an imaginary number identifier.
  • u b contains two columns; the first column V b 1 is v f b ( i ) , and the second column V b 2 is V h b ( i ) .
  • ⁇ g ( md b , i ).
  • v f b i 1 e j 2 ⁇ f b i / 32 e j 4 ⁇ f b i / 32 e j 6 ⁇ f b i / 32 T .
  • v h b i 1 e j 2 ⁇ h b i / 32 e j 4 ⁇ h b i / 32 e j 6 ⁇ h b i / 32 T .
  • g ( md b , i ) j ( md b + i )
  • md b is an initial value
  • i is a resource index number
  • j is an imaginary number identifier.
  • g ( md b , i ) needs to be equal to - g ( md a , i ); g ( md b , i ) needs to be equal to - g ( md a , i ) and further, g ( md b , i ) and the g ( md a ,i ) can be scalars of the following set ⁇ 1, j ,-1,- j ⁇ .
  • q is an integer
  • the values of p1, p2, p3 and p4 are one of 1, 2, 3 and 4, and are different from each other;
  • the sending end (the base station) performs the open loop precoding on at least 1 UE.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 1 UE, wherein, the UE is of one layer transmission.
  • resources such as Nb minimum transmission resources (Resource Element, abbreviated as REs)
  • REs resource Element
  • f a i K a i + N a .
  • the sending end (the base station) performs the open loop precoding on at least 1 UE.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 1 UE, wherein, the UE is of two-layer transmission.
  • resources such as Nb minimum transmission resources (Resource Element, abbreviated as REs)
  • REs resource Element
  • g ( md b , i ) needs to be equal to - g ( md a , i ).
  • f a ( i ) K a i + N a
  • f b ( i ) K b i + N b
  • v f b ( i ) and v f a ( i ) are the same
  • K a , N a , K b and N b are all integers.
  • the sending end (the base station) performs the open loop precoding on at least 2 UEs.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 1 UE, wherein, the UE is of four layers.
  • REs resource Element
  • u a contains two columns; the first column V a 1 is v f a ( i ) , and the second column V a 2 is v h a ( i ) .
  • ⁇ g ( md a , i ).
  • v f a i 1 e j 2 ⁇ f a i / 32 e j 4 ⁇ f a i / 32 e j 6 ⁇ f a i / 32 T .
  • v h a i 1 e j 2 ⁇ h a i / 32 e j 4 ⁇ h a i / 32 e j 6 ⁇ h a i / 32 T .
  • g ( md a , i ) j ( md a + i ) , wherein, md a is an initial value, i is a resource index number, and j is an imaginary number identifier.
  • u b contains two columns; the first column V b 1 is v f b ( i ) , and the second column V b 2 is v h b ( i ) .
  • ⁇ g ( md b , i ).
  • v f b i 1 e j 2 ⁇ f b i / 32 e j 4 ⁇ f b i / 32 e j 6 ⁇ f b i / 32 T .
  • v h b i 1 e j 2 ⁇ h b i / 32 e j 4 ⁇ h b i / 32 e j 6 ⁇ h b i / 32 T .
  • g ( md b , i ) j ( md b + i ) , md b is an initial value, i is a resource index number, and j is an imaginary number identifier.
  • g ( md b , i ) needs to be equal to - g ( md a , i ).
  • f a ( i ) K a i + N a
  • f b ( i ) K b i + N b
  • h a ( i ) K a i + N a
  • h a ( i ) K b i + N b
  • K a , N a , K b , N b , K a , N a , K b , and N b are all integers.
  • v h a ( i ) is equal to v f a ( i )
  • v h b ( i ) is equal to v f b ( i ) .
  • the sending end (the base station) performs the open loop precoding on at least 2 UEs.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 2 UEs, and each UE is of one layer.
  • Nb minimum transmission resources Resource Element, abbreviated as REs
  • q is an integer, and the values of p1, p2, p3 and p4 are one of 1, 2, 3 and 4, and are different from each other; W 0 1 , W 2 1 , W 8 1 and W 10 1 are same with the definition in the LTE 4 antenna codebook.
  • md a is a parameter related to the number of layers or the mode.
  • q is an integer, and the values of q1, q2, q3 and q4 are one of 1, 2, 3 and 4, and are different from each other; W 1 ⁇ 1 ⁇ , W 3 1 , W 9 1 and W 11 1 are same with the definition in the LTE 4 antenna codebook.
  • mdb is a parameter related to the number of layers or the mode.
  • the sending end (the base station) performs the open loop precoding on at least 1 UE.
  • the open loop precoding method used by the base station is not based on the feedback of the receiving end (UE), but based on a predetermined open loop precoding mode.
  • that open loop precoding mode is that: in a segment of transmission resources, such as Nb minimum transmission resources (Resource Element, abbreviated as REs), the base station serves 1 UE, and the UE is of two-layer transmission.
  • resources such as Nb minimum transmission resources (Resource Element, abbreviated as REs)
  • REs resource Element
  • the base station serves 1 UE
  • the UE is of two-layer transmission.
  • q is an integer
  • the present document further includes a precoding indication method for open loop spatial multiplexing, including: a base station determining precoding modes of data of all layers to be sent, and notifying terminals corresponding to the data of all layers of the precoding modes corresponding to the data of all layers.
  • the precoding mode refers to the number of precoding operations performed to the data to be sent and the number of the data layers processed in every precoding operation. For example, for a terminal with 2-layer data to be sent totally, one of the usable precoding modes is to perform a whole 2-layer precoding on the 2-layer data; another precoding mode is to perform 1 layer precoding on 1 layer therein and perform 1 layer precoding on another layer therein.
  • the terminals calculate and report channel quality indications according to acquired precoding modes of data of all layers.
  • the embodiment of the present document can implement effective precoding in the case of open loop spatial multiplexing, and also can support multiple antennas (such as 8 transmission antennas) application.

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Claims (13)

  1. Un procédé de précodage pour multiplexage spatial en boucle ouverte, caractérisé en ce qu'il comprend :
    dans des ressources de transmission, une station de base précodant des données de couche N à envoyer en utilisant w a = u a α ⋅ u a
    Figure imgb0220
     dans lequel ua est un vecteur ou une matrice liée à un emplacement de ressource de transmission i ;
    α est un nombre réel ou un nombre complexe lié à l'emplacement de ressource de transmission i et α est un scalaire dans un ensemble suivant {1, j, -1, -j} ; et N est un entier inférieur ou égal à un nombre d'antennes de transmission de station de base ;
    dans lequel,
    α = g(i); g i = { 1 , mod ⌊ i q ⌋ 4 = p 1 j , mod ⌊ i q ⌋ 4 = p 2 − 1 , mod ⌊ i q ⌋ 4 = p 3 − j , mod ⌊ i q ⌋ 4 = p 4 ;
    Figure imgb0221
     dans lequel, q est un entier, les valeurs de p1, p2, p3 et p4 sont l'une de 1, 2, 3 et 4 et diffèrent les unes des autres, et i est un numéro d'indice de ressource ; ou g i = { 1 , mod ⌊ i q ⌋ 2 = p 1 − 1 , mod ⌊ i q ⌋ 2 = p 3
    Figure imgb0222
     dans lequel, q est un entier, les valeurs de p1 et p3 sont l'une de 1 et 2, et diffèrent l'une de l'autre, et i est un numéro d'indice de ressource.
  2. Le procédé selon la revendication 1, dans lequel
    la ua contient N colonnes, la nième colonne est V a n
    Figure imgb0223
     et V a n
    Figure imgb0224
     est liée à i.
  3. Le procédé selon la revendication 2, dans lequel V a n = 1 e j 2 ⁢ π ⁢ X / 32 e j 4 ⁢ π ⁢ X / 32 e j 6 ⁢ π ⁢ X / 32 T ,
    Figure imgb0225
     dans lequel, X est un entier et les valeurs de X sont différentes pour un n différent.
  4. Le procédé selon la revendication 1, 2 ou 3, dans lequel,
    dans les ressources de transmission, la station de base précode des données de couche M à envoyer en plus des données de couche N en utilisant w b = u b β ⋅ u b ,
    Figure imgb0226
     dans lequel ub est un vecteur ou une matrice liée à l'emplacement de ressource de transmission i ; β est un nombre réel ou un nombre complexe lié à l'emplacement de ressource de transmission i ; β=-α pour les mêmes emplacements de ressource de transmission; et N est un entier inférieur ou égal au nombre d'antennes de transmission de station de base.
  5. Le procédé selon la revendication 4, dans lequel
    la ub contient M colonnes, la nième colonne est V b n
    Figure imgb0227
     et V b n
    Figure imgb0228
     est liée à i,
    dans lequel, V b n = 1 e j 2 ⁢ π ⁢ X / 32 e j 4 ⁢ π ⁢ X / 32 e j 6 ⁢ π ⁢ X / 32 T ,
    Figure imgb0229
    dans lequel, X est un entier, et les valeurs du X sont différentes pour un n différent,
    ou,
    dans lequel,
    lorsque les données de couche N et les données de couche M appartiennent à un même utilisateur, la ua et la ub sont les mêmes ou différentes ; quand une somme du M et du N est plus grande que 2 et que la ua et la ub sont différentes, les colonnes contenues dans la ua sont un sous-ensemble des colonnes contenues dans la ub, ou les colonnes contenues dans la ub sont un sous-ensemble des colonnes contenues dans la ua.
  6. Le procédé selon la revendication 4, dans lequel
    lorsque les données de couche N et les données de couche M appartiennent à des utilisateurs différents, la ua et la ub sont différentes.
  7. Le procédé selon la revendication 6, dans lequel
    la ua et la ub sont orthogonales.
  8. Le procédé selon l'une quelconque des revendications 1 à 7, comprenant en outre :
    la station de base déterminant des modes de précodage de données de toutes les couches à envoyer, et notifiant des terminaux correspondant aux données de toutes les couches des modes de précodage correspondant aux données de toutes les couches.
  9. Le procédé selon la revendication 8, dans lequel
    le mode de précodage se réfère à un nombre d'opérations de précodage effectuées sur les données à envoyer et à un nombre des couches de données traitées dans chaque opération de précodage,
    ou,
    dans lequel,
    les bornes calculent et rapportent des indications de qualité de canal selon des modes de précodage acquis des données de toutes les couches.
  10. Un système de précodage pour multiplexage spatial en boucle ouverte, caractérisé en ce qu'il comprend un dispositif de station de base ; dans lequel
    le dispositif de station de base est configuré pour : dans des ressources de transmission, précoder des données de couche N à envoyer en utilisant w a = u a α ⋅ u a ,
    Figure imgb0230
     dans lequel, ua est un vecteur ou une matrice liée à un emplacement de ressource de transmission i ; α est un nombre réel ou un nombre complexe lié à l'emplacement de ressource de transmission i et α est un scalaire dans un ensemble suivant {1, j, -1, -j} ; et N est un entier inférieur ou égal à un nombre d'antennes de transmission de station de base ;
    dans lequel,
    α = g(i); g i = { 1 , mod ⌊ i q ⌋ 4 = p 1 j , mod ⌊ i q ⌋ 4 = p 2 − 1 , mod ⌊ i q ⌋ 4 = p 3 − j , mod ⌊ i q ⌋ 4 = p 4 ;
    Figure imgb0231
     dans lequel, q est un entier, les valeurs de p1, p2, p3 et p4 sont l'une de 1, 2, 3 et 4, et diffèrent les unes des autres, et i est un numéro d'indice de ressource ; ou, g i = { 1 , mod ⌊ i q ⌋ 2 = p 1 − 1 , mod ⌊ i q ⌋ 2 = p 3
    Figure imgb0232
     dans lequel, q est un entier, les valeurs de p1 et p3 sont l'une de 1 et 2 et diffèrent l'une de l'autre, et i est un numéro d'indice de ressource.
  11. Le système selon la revendication 10, dans lequel

    la ua contient N colonnes, la nième colonne est V a n
    Figure imgb0233
     et V a n
    Figure imgb0234
     est liée à i ; et V a n = 1 e j 2 ⁢ π ⁢ X / 32 e j 4 ⁢ π ⁢ X / 32 e j 6 ⁢ π ⁢ X / 32 T ,
    Figure imgb0235
     dans lequel, X est un entier et les valeurs du X sont différentes pour un n différent.
  12. Le système selon la revendication 10 ou 11, dans lequel
    le dispositif de station de base est en outre configuré pour : dans les ressources de transmission, précoder des données de couche M à envoyer en plus des données de couche N en utilisant w b = u b β ⋅ u b ,
    Figure imgb0236
     dans lequel ub est un vecteur ou une matrice liée à l'emplacement de ressource de transmission i ; β est un nombre réel ou un nombre complexe lié à l'emplacement de ressource de transmission i ; β = -α pour les mêmes emplacements de ressource de transmission; et N est un entier inférieur ou égal au nombre d'antennes de transmission de station de base.
  13. Le système selon la revendication 12, dans lequel
    la ub contient M colonnes, la nième colonne est V b n ,
    Figure imgb0237
     et V b n
    Figure imgb0238
     est liée à i,
    ou,
    dans lequel,
    lorsque les données de couche N et les données de couche M appartiennent à un même utilisateur, la ua et la ub sont les mêmes ou différentes ; quand une somme du M et du N est plus grande que 2 et que la ua et la ub sont différentes, les colonnes contenues dans la ua sont un sous-ensemble des colonnes contenues dans la ub, ou les colonnes contenues dans la ub sont un sous-ensemble des colonnes contenues dans la ua ; et
    lorsque les données de couche N et les données de couche M appartiennent à des utilisateurs différents, la ua et la ub sont orthogonales.
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US20140010327A1 (en) 2014-01-09
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